Area range command for route summarization

Is "area X range" command applicable for summarizing intra-area routes of non-backbone as well as backbone area? ie, using this command, can summarized routes be sent from non-backbone to backbone and vice versa?

Yes, You should be able to do it.
This is one way of stopping OSPF Loopback interfaces from appearing as a /32 host route.
Have a look here for more detail...
http://www.nish.com/2009/12/ospf-loopback-interface/

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